K 1Àx Rb x Sc(MoO 4 ) 2 single crystals doped with Cr 3þ were studied by electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy and optical microscopy. It has been found that the EPR spectra in solid solutions for x 0.2 are inhomogeneously broadened due to the random occupation of the next nearest-neighbour cation sites K þ and Rb þ . The spin-Hamiltonian parameters describing the room-temperature EPR spectra of Cr 3þ in K 1Àx Rb x Sc(MoO 4 ) 2 are calculated. The behaviour of the EPR spectra versus temperature reveals the existence of structural phase transitions in these crystals. The results show that a substitution of K þ by Rb þ suppresses the transition temperatures. The optical investigations carried out under the polarizing microscope have shown a ferroelastic nature of these transformations.
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